Vulnerability Note VU#748355
ASN.1 parsing errors exist in implementations of SSL, TLS, S/MIME, PKCS#7 routines
Abstract Syntax Notation number One (ASN.1) is an international standard used to describe and transmit data packets between applications and across networks. There is a vulnerability related to ASN.1 that could permit an attacker to cause a denial of service or potentially execute arbitrary code.
The ASN.1 library used by OpenSSL has several parsing errors which allow malformed certificate encodings to be parsed incorrectly. Attackers can exploit this vulnerability remotely to cause a denial of service or potentially execute arbitrary code, depending on the circumstance under which the vulnerable parser is exercised. Routines affected include those supporting SSL and TLS applications, as well as S/MIME (PKCS#7) and certificate creation.
Specifically, the parser implemented in various ASN.1 libraries accepts certain invalidly encoded data (in this case with an invalid length parameter) leading to improper interpretation of the data. This leads to undefined behavior which may lead to other security-related impacts (data executed as code, service termination, disclosure of sensitive information).
Attackers can exploit this vulnerability remotely to cause a variety of impacts, including denial of service, arbitrary code execution, and disclosure of sensitive information.
Apply the patches made available by your vendor, or upgrade to the recommended version. The "Systems Affected" section contains a list of vendors and details about the status of their products. Clicking on the vendor name will provide you with any statements that the vendor has made.
Systems Affected (Learn More)
|Vendor||Status||Date Notified||Date Updated|
|Apple Computer Inc.||Affected||29 Jul 2002||09 Aug 2002|
|Debian||Affected||29 Jul 2002||09 Aug 2002|
|Guardian Digital||Affected||29 Jul 2002||09 Aug 2002|
|Hewlett-Packard Company||Affected||29 Jul 2002||09 Aug 2002|
|IBM||Affected||29 Jul 2002||09 Aug 2002|
|ISC||Affected||-||09 Aug 2002|
|Juniper Networks||Affected||29 Jul 2002||16 Aug 2002|
|MandrakeSoft||Affected||-||23 Sep 2002|
|NetBSD||Affected||29 Jul 2002||23 Sep 2002|
|OpenLDAP||Affected||29 Jul 2002||09 Aug 2002|
|OpenPKG||Affected||-||09 Aug 2002|
|OpenSSL||Affected||22 Jul 2002||09 Aug 2002|
|Oracle||Affected||29 Jul 2002||10 Aug 2002|
|Red Hat Inc.||Affected||29 Jul 2002||09 Aug 2002|
|Secure Computing Corporation||Affected||-||30 Sep 2002|
CVSS Metrics (Learn More)
This vulnerability was independently discovered by Adi Stav and James Yonan. Our thanks to Stephen Henson for reporting on this vulnerability.
This document was written by Jason A Rafail and Jeffrey S. Havrilla.
- CVE IDs: CAN-2002-0659
- CERT Advisory: CA-2002-23
- Date Public: 30 Jul 2002
- Date First Published: 30 Jul 2002
- Date Last Updated: 30 Sep 2002
- Severity Metric: 31.33
- Document Revision: 32
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